Hottest June

June was the warmest on record, extending months of record-setting heat. This year has had the warmest average temperature for January-June on record -- 57.5 F, according to the National Oceanic and Atmospheric Administration (NOAA).

June was the warmest on record, extending months of record-setting heat. This year has had the warmest average temperature for January-June on record -- 57.5 F, according to the National Oceanic and Atmospheric Administration (NOAA). (Photo by Patrick Lin/AFP/Getty Images)

June was the warmest on record, extending months of record-setting heat. This year has had the warmest average temperature for January-June on record -- 57.5 F, according to the National Oceanic and Atmospheric Administration (NOAA).Photo by Patrick Lin/AFP/Getty Images